samples/minimal/minimal.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        minimal.cpp
   3 // Purpose:     Minimal wxWidgets sample
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx/wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 // for all others, include the necessary headers (this file is usually all you
  28 // need because it includes almost all "standard" wxWidgets headers)
  29 #ifndef WX_PRECOMP
  30     #include "wx/wx.h"
  31 #endif
  32
  33 // ----------------------------------------------------------------------------
  34 // resources
  35 // ----------------------------------------------------------------------------
  36
  37 // the application icon (under Windows and OS/2 it is in resources and even
  38 // though we could still include the XPM here it would be unused)
  39 #if !defined(__WXMSW__) && !defined(__WXPM__)
  40     #include "../sample.xpm"
  41 #endif
  42
  43 // ----------------------------------------------------------------------------
  44 // private classes
  45 // ----------------------------------------------------------------------------
  46
  47 // Define a new application type, each program should derive a class from wxApp
  48 class MyApp : public wxApp
  49 {
  50 public:
  51     // override base class virtuals
  52     // ----------------------------
  53
  54     // this one is called on application startup and is a good place for the app
  55     // initialization (doing it here and not in the ctor allows to have an error
  56     // return: if OnInit() returns false, the application terminates)
  57     virtual bool OnInit();
  58 };
  59
  60 // Define a new frame type: this is going to be our main frame
  61 class MyFrame : public wxFrame
  62 {
  63 public:
  64     // ctor(s)
  65     MyFrame(const wxString& title);
  66
  67     // event handlers (these functions should _not_ be virtual)
  68     void OnQuit(wxCommandEvent& event);
  69     void OnAbout(wxCommandEvent& event);
  70
  71     void OnPaint(wxPaintEvent&)
  72     {
  73         wxPaintDC dc(this);
  74
  75         wxFont font = GetFont();
  76
  77         for ( int size = 10; size < 20; size++ )
  78         {
  79             font.SetPixelSize(wxSize(0, size));
  80             dc.SetFont(font);
  81             dc.DrawText(wxString::Format("%dpx The quick brown fox jumps over the lazy dog.", size),
  82                         10, 10 + (size - 10)*20);
  83         }
  84     }
  85
  86
  87 private:
  88     // any class wishing to process wxWidgets events must use this macro
  89     DECLARE_EVENT_TABLE()
  90 };
  91
  92 // ----------------------------------------------------------------------------
  93 // constants
  94 // ----------------------------------------------------------------------------
  95
  96 // IDs for the controls and the menu commands
  97 enum
  98 {
  99     // menu items
 100     Minimal_Quit = wxID_EXIT,
 101
 102     // it is important for the id corresponding to the "About" command to have
 103     // this standard value as otherwise it won't be handled properly under Mac
 104     // (where it is special and put into the "Apple" menu)
 105     Minimal_About = wxID_ABOUT
 106 };
 107
 108 // ----------------------------------------------------------------------------
 109 // event tables and other macros for wxWidgets
 110 // ----------------------------------------------------------------------------
 111
 112 // the event tables connect the wxWidgets events with the functions (event
 113 // handlers) which process them. It can be also done at run-time, but for the
 114 // simple menu events like this the static method is much simpler.
 115 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 116     EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
 117     EVT_MENU(Minimal_About, MyFrame::OnAbout)
 118     EVT_PAINT(MyFrame::OnPaint)
 119 END_EVENT_TABLE()
 120
 121 // Create a new application object: this macro will allow wxWidgets to create
 122 // the application object during program execution (it's better than using a
 123 // static object for many reasons) and also implements the accessor function
 124 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 125 // not wxApp)
 126 IMPLEMENT_APP(MyApp)
 127
 128 // ============================================================================
 129 // implementation
 130 // ============================================================================
 131
 132 // ----------------------------------------------------------------------------
 133 // the application class
 134 // ----------------------------------------------------------------------------
 135
 136 // 'Main program' equivalent: the program execution "starts" here
 137 bool MyApp::OnInit()
 138 {
 139     // call the base class initialization method, currently it only parses a
 140     // few common command-line options but it could be do more in the future
 141     if ( !wxApp::OnInit() )
 142         return false;
 143
 144     // create the main application window
 145     MyFrame *frame = new MyFrame("Minimal wxWidgets App");
 146
 147     // and show it (the frames, unlike simple controls, are not shown when
 148     // created initially)
 149     frame->Show(true);
 150
 151     // success: wxApp::OnRun() will be called which will enter the main message
 152     // loop and the application will run. If we returned false here, the
 153     // application would exit immediately.
 154     return true;
 155 }
 156
 157 // ----------------------------------------------------------------------------
 158 // main frame
 159 // ----------------------------------------------------------------------------
 160
 161 // frame constructor
 162 MyFrame::MyFrame(const wxString& title)
 163        : wxFrame(NULL, wxID_ANY, title)
 164 {
 165     // set the frame icon
 166     SetIcon(wxICON(sample));
 167
 168 #if wxUSE_MENUS
 169     // create a menu bar
 170     wxMenu *fileMenu = new wxMenu;
 171
 172     // the "About" item should be in the help menu
 173     wxMenu *helpMenu = new wxMenu;
 174     helpMenu->Append(Minimal_About, "&About...\tF1", "Show about dialog");
 175
 176     fileMenu->Append(Minimal_Quit, "E&xit\tAlt-X", "Quit this program");
 177
 178     // now append the freshly created menu to the menu bar...
 179     wxMenuBar *menuBar = new wxMenuBar();
 180     menuBar->Append(fileMenu, "&File");
 181     menuBar->Append(helpMenu, "&Help");
 182
 183     // ... and attach this menu bar to the frame
 184     SetMenuBar(menuBar);
 185 #endif // wxUSE_MENUS
 186
 187 #if wxUSE_STATUSBAR
 188     // create a status bar just for fun (by default with 1 pane only)
 189     CreateStatusBar(2);
 190     SetStatusText("Welcome to wxWidgets!");
 191 #endif // wxUSE_STATUSBAR
 192 }
 193
 194
 195 // event handlers
 196
 197 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 198 {
 199     // true is to force the frame to close
 200     Close(true);
 201 }
 202
 203 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 204 {
 205     wxMessageBox(wxString::Format
 206                  (
 207                     "Welcome to %s!\n"
 208                     "\n"
 209                     "This is the minimal wxWidgets sample\n"
 210                     "running under %s.",
 211                     wxVERSION_STRING,
 212                     wxGetOsDescription()
 213                  ),
 214                  "About wxWidgets minimal sample",
 215                  wxOK | wxICON_INFORMATION,
 216                  this);
 217 }